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Date: Thu, 1 Mar 2012 10:30:15 -0300
From: Luiz Capitulino <lcapitulino@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 3/6] rename blockdev-group-snapshot-sync
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, Jeff Cody <jcody@redhat.com>, qemu-devel <qemu-devel@nongnu.org>, Federico Simoncelli <fsimonce@redhat.com>, Eric Blake <eblake@redhat.com>

On Wed, 29 Feb 2012 16:23:20 +0100
Paolo Bonzini <pbonzini@redhat.com> wrote:

> Il 29/02/2012 16:08, Luiz Capitulino ha scritto:
> >> > 
> >> > but it can just be omitted, I wasn't sure of how QAPI handled optionals.
> > Do you now?
> 
> Perhaps not. :)
> 
> > All optionals will be accompanied of a 'bool has_OPTIONAL_NAME', this bool
> > will be true if the optional has been passed by the caller/client or false
> > otherwise (in which case you shouldn't trust it).
> 
> My understanding was that in this case I can trust the value to be
> all-zeros (zero, false, 0.0, NULL), at least in the context of QAPI.
> The QmpInputVisitor uses g_malloc0.

Yes, as a side effect :) I mean, I don't think the reason for using g_malloc0()
was to have optionals zeroed. If we're going to count on this, then it's
better to make it explicit and/or document it.